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单词 ellipse
释义 el·lipse
\ə̇ˈlips, eˈ-, ēˈ-\ noun
(-s)
Etymology: alteration of ellipsis
1. : an elongated circle : a regular oval; specifically : a closed plane curve generated by a point so moving that its distance from a fixed point divided by its distance from a fixed line is a positive constant less than 1
2. : ellipsis
[ellipse 1: French, F' foci; P, P', P'' any point on the curve; FP + PF' = FP'' + P''F' = FP' + P'F']
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